In order to win the ongoing war against their once fellow beings, the ruler of Angels sends his son Taehyung down to earth to capture a special someone who holds the key to everything. Accompanying him on his mission are his two most trustee warriors Baekhyun and Hoseok. Following his father's orders, Taehyung sets off to earth to find a girl named Kim Taeyeon.    Kim Taeyeon is a human(?) girl who is living her life as an idol. She is a part of a trio group called TaeTiSeo in